Project export with 3d tasks

[ActiveChooN]

Motivation and context

Added ability to export project dataset with 3d tasks
Depends on #3365

How has this been tested?

Manually

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG file
  - [ ] I have updated the documentation accordingly
  - [ ] I have added tests to cover my changes
  - [ ] I have linked related issues (read github docs)
  - [ ] I have increased versions of npm packages if it is necessary (cvat-canvas,
  cvat-core, cvat-data and cvat-ui)

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

[zhiltsov-max]

Think of implementing this class as (roughly):

task_datasets = { task_id: make_task_dataset(task) for task_id, task in tasks }
# append name mangling and other transforms like
for task_id, task_dataset in task_datasets.items():
  task_dataset.transform('rename', ...)

dataset = Dataset.from_extractors(*task_datasets)

[bsekachev]

I am not expert in cvat/apps/dataset_manager, so I only tried this patch and was able to export both tasks and projects in 3D format. Just one question, if we dump 3D tasks we can only choice between PCD and kitty formats. But when we dump a project with one 3D tasks it shows all the formats (at the same time I cannot create a project with both 3D and 2D data). Is this expected behaviour?

[bsekachev]

@zhiltsov-max Do you have any new comments on the PR? I didn't see your approve

[ActiveChooN]

But when we dump a project with one 3D tasks it shows all the formats (at the same time I cannot create a project with both 3D and 2D data). Is this expected behaviour?

@bsekachev, fixed

[zhiltsov-max]

1. Fix to my reported problem 3: Use either os.path.splitext() or str.rsplit(s, maxsplit=1)

2. Use of split() here does not conform to 2d formats and established CVAT behavior here, because 2d formats preserve the relative path information (to handle the problem with frames with same names in different dirs). Yes, it was discussed in the original 3d PR, but they refused to change it.

[zhiltsov-max]

My comments:

1. 
   

I think, it would be more user-friendly, if delete had red background and was positioned after exporting. How about renaming "export task dataset" to "export (as) dataset"? Two very similar names confuse.
2.
After the button is pressed and the menu disappears, when I reopen the menu, it has the button highlighted.
3. Export in sly pcd of a task with images:

и.м.г@ 1.JPEG
им. 536.45.--+=.г 3.jpeg
им.png.г 2.jpg
имг 3 (копия 1).jpeg

Error: Request failed with status code 500. "datumaro.components.errors.RepeatedItemError: Item ('им', 'qqqaaq') is repeated in the source sequence.\n".

4. 2d project dataset export menu has 3d formats. Task export doesn't
5. 
   The display of subset names looks a bit unclear to me. Maybe, it should be improved.
6. I didn't see 2d / 3d task / project indicator anywhere. Maybe, it's worth adding.

[ActiveChooN]

@zhiltsov-max

I think, it would be more user-friendly, if delete had a red background and was positioned after exporting.

Fixed. I'm not sure about the red color on menu items, there is already a red button on the delete modal.

Export in sly pcd of a task with images:

Fixed

Other comments are not very related to this PR so I moved them to a separate issue.

[ActiveChooN]

@dvkruchinin, hi, can you add tests for this feature, please?

[dvkruchinin]

@dvkruchinin, hi, can you add tests for this feature, please?

Sure. A test will be prepared.